In the yawncat (a rare hypothetical animal), the dominant allele R causes solid tail color, and the recessive allele r results in white spots on a colored backgrounD. The black coat color allele B is dominant to the brown allele b, but these genes can only be expressed if the animal has an mm genotype at a third gene locus. Animals that are M_ are yellow regardless of which allele from the B locus is present. A mating between a solid yellow-tailed male yawncat and a solid brown-tailed female yawncat produces 16 offspring with the following tail phenotypes: six solid yellow, two spotted yellow, three solid black, one spotted black, three solid brown, and one spotted brown. What is the most likely genotype of the male parent?

Respuesta :

Answer:

The male's genotype is MmRrBb.

Explanation:

The dominant allele R causes solid tail color, and the recessive allele r results in white spots on a colored background.

The black coat color allele B is dominant to the brown allele b

But these genes can only be expressed if the animal has an mm genotype at a third gene locus. Animals that are M_ are yellow regardless of which allele from the B locus is present.

A mating between a solid yellow-tailed male yawn  cat and a solid brown-tailed female yawncat

the offspring:

6 M_R_ solid yellow

2 M_rr spotted yellow

3 mmR_B_ solid black

1 mmrrB_ spotted black

3mmR_bb solid brown

1mmrrbb

Since the female's genotype is mmR_bb. To produce offspring with these varying genotypes; each parent contributes one copy each. Since the male is a solid yellow, we can say part of his genotype is: M_R_.

Among the offspring, there is the presence of the dominant B allele, thus we can assume his genotype to be: M_R_B_.

Among the offspring, we have those that express the black and brown colour and to get the brown colour (b), the two parents must possess a copy each of both the m that allows expression and b that allows for brown colour. Thus the male genotype is: MmR_Bb.

There are also spotted ones among that can express this trait when both parent possess one copy each of r allele. Thus the male's genotype is MmRrBb.

Thus the mating will be between MmRrBb and mmR_bb to produce those stes of progeny.